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2 years ago

Which of these solutes raises the boiling point of water the most?

Chemistry

2 answers:

yarga [219]2 years ago

8 0

Answer:

This solute raises the boiling point of water the most, ionic aluminum fluoride (AlF3)

Explanation:

Boiling point elevation is one of the colligative properties. These are properties only for solutions and they depend on the number of dissolved particles, the solute.

In the colligative properties you should take account the value of i, which means Van't Hoff factor and it represents degree of dissociation of solutes that are electrolytes.

Ths is the formula for boling point elevation:

ΔT = Kb · molality · i

ΔT = Tb (solution) - Tb (pure solvent)

Kb = ebullioscopic constant

i = Van't Hoff factor

In sucrose, the i is 1 (non electrolyte)

NaCl ---> Na+ + Cl- (the i is 2, you have 2 ions)

KBr ---> K+ + Br- (the same as NaCl)

CaCl2 ----> Ca2+ + 2Cl- (the i is 3)

AlF3 ----> Al3+ + 3F- (the i is 4)

spin [16.1K]2 years ago

3 0

Ionic aluminum fluoride (AIF3)

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What is the molarity and molality of a solution that is 10.00 % by mass potassium hydrogen carbonate (KHCO3, 100.11 g/mol) and h

maksim [4K]

Answer: The molarity and molality of a solution is 1.06 M and 1.11 m respectively.

Explanation:

Molality of a solution is defined as the number of moles of solute dissolved per kg of the solvent.

$Molality=\frac{n\times 1000}{W_s}$

where,

n = moles of solute =

$W_s$ = weight of solvent in g

10.00 g of potassium hydrogen carbonate in 100 g of solution

mass of solvent = mass of solution - mass of solute = (100.0-10.00) = 90.0 g

$Molality=\frac{0.09985\times 1000}{90.0}=1.11m$

2. Molarity of a solution is defined as the number of moles of solute dissolved per Liter of the solution.

$Molarity=\frac{n\times 1000}{V_s}$

where,

n= moles of solute = 0.09985

$V_s$ = volume of solution in ml

Density of solution = 1036.5 g/L

Volume of solution = $\frac{\text {mass of solution}}{\text {Density of solution}}=\frac{100.0g}{1.0650g/ml}=93.90ml$

$Molality= \frac{0.09985\times 1000}{93.90ml}=1.06M$

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2 years ago

Why is nonpoint source pollution potentially more harmful than point source pollution?

Vadim26 [7]

A, nonpoint souce pollution is "a main problem with water quality."

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2 years ago

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The enthalpy change for the explosion of ammonium nitrate with fuel oil is –7198 kJ for every 3 moles of NH4NO3. What is the ent

anastassius [24]

Answer:

−2399.33 kJ

Explanation:

If NH₄NO₃ reacts with fuel oil to give a ΔH of -7198 for every 3 moles of NH₄NO₃

What is the enthalpy change for 1.0 mole of NH₄NO₃ in this reaction

∴ For every 1 mole, we will have $\frac{1}{3}$ of the total enthaply of the 3 moles

so, to determine the 1 mole; we have:

$\frac{1}{3}*(-7198kJ)$

= −2399.33 kJ

∴ the enthalpy change for 1.0 mole of NH₄NO₃ in this reaction = −2399.33 kJ

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2 years ago

What is the molarity of a solution that contains 0.500 mole of kno3 dissolved in 0.500-liter of solution?

belka [17]

Answer : The molarity of solution is, 1.00 M

Explanation : Given,

Moles of $KNO_3$ = 0.500 mol

Volume of solution = 0.500 L

Molarity : It is defined as the number of moles of solute present in one liter of volume of solution.

Formula used :

$\text{Molarity}=\frac{\text{Moles of }KNO_3}{\text{Volume of solution (in L)}}$

Now put all the given values in this formula, we get:

$\text{Molarity}=\frac{0.500mol}{0.500L}=1.00mole/L=1.00M$

Therefore, the molarity of solution is, 1.00 M

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2 years ago

A vessel contained N2, Ar, He, and Ne. The total pressure in the vessel was 987 torr. The partial pressures of nitrogen, argon,

xz_007 [3.2K]

Answer:

The partial pressure of neon in the vessel was 239 torr.

Explanation:

In all cases involving gas mixtures, the total gas pressure is related to the partial pressures, that is, the pressures of the individual gaseous components of the mixture. Put simply, the partial pressure of a gas is the pressure it exerts on a mixture of gases.

Dalton's law states that the total pressure of a mixture of gases is equal to the sum of the pressures that each gas would exert if it were alone. Then:

PT= P1 + P2 + P3 + P4…+ Pn

where n is the amount of gases present in the mixture.

In this case:

PT=PN₂ + PAr + PHe + PNe

where:

PT= 987 torr
PN₂= 44 torr
PAr= 486 torr
PHe= 218 torr
PNe= ?

Replacing:

987 torr= 44 torr + 486 torr + 218 torr + PNe

Solving:

987 torr= 748 torr + PNe

PNe= 987 torr - 748 torr

PNe= 239 torr

<u><em>The partial pressure of neon in the vessel was 239 torr.</em></u>

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2 years ago